dsh-fish-shell: Running Bash Commands in DSH with Fish Shell

`dsh-fish-shell` is a DeepSeek Harness (DSH) plugin designed to convert model-submitted `bash` tool calls into `fish -c` execution while keeping the interface unchanged. It supports command conversion, session updates, and terminal compatibility, and can preprocess Bash syntax via Babelfish. Installation requires navigating into the plugin directory and restarting DSH; the configuration can specify `fishPath`. This plugin requires DSH version 0.1.0-rc.6+ and Node.js >= 22. Note that it is not a general-purpose Bash compatibility layer, failed translation stops execution, and it supports only basic Bash syntax.